Backport a bugfix from 3.02a07:

-	mkisofs: when stripping off "./" and "//" from graft points, mkisofs
	now uses ovstrcpy() that supports to copy overlapping strings as Mac OS
	has a strlcpy() that fails with overlapping strings.
	Thanks to a hint from Colin Finck <colin@reactos.org>
--- mkisofs/mkisofs.c.orig	2015-01-01 08:19:51.000000000 -0600
+++ mkisofs/mkisofs.c	2020-09-30 13:30:39.000000000 -0500
@@ -1443,6 +1443,7 @@
 						char **short_namep, BOOL do_insert));
 EXPORT	void	*e_malloc	__PR((size_t size));
 EXPORT	char	*e_strdup	__PR((const char *s));
+LOCAL	void	ovstrcpy	__PR((char *p2, char *p1));
 LOCAL	void	checkarch	__PR((char *name));
 
 LOCAL void
@@ -3680,7 +3681,11 @@
 			while (*xpnt == PATH_SEPARATOR) {
 				xpnt++;
 			}
-			strlcpy(graft_point, xpnt, glen);
+			/*
+			 * The string becomes shorter, there is no need to check
+			 * the length. Make sure to support overlapping strings.
+			 */
+			ovstrcpy(graft_point, xpnt);
 		} while (xpnt > graft_point);
 
 		if (node) {
@@ -3853,6 +3858,18 @@
 	return (ret);
 }
 
+/*
+ * A strcpy() that works with overlapping buffers
+ */
+LOCAL void
+ovstrcpy(p2, p1)
+	register char	*p2;
+	register char	*p1;
+{
+	while ((*p2++ = *p1++) != '\0')
+		;
+}
+
 LOCAL void
 checkarch(name)
 	char	*name;